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J Neurobiol. 1999 Apr;39(1):29-40.
Concanavalin A protects hair cells against gentamicin ototoxicity in rat cochlear explant cultures.

Zheng JL, Gao WQ.

Department of Neuroscience, Genentech, Inc., South San Francisco, CA 94080, USA>

Degeneration of hair cells and spiral ganglion neurons due to acoustic trauma and various ototoxins is a major cause of hearing loss. Although our previous study demonstrates that specific neurotrophins protect spiral ganglion neurons from ototoxic insult, they do not protect hair cells. In the present experiments, we used postnatal rat cochlear explant cultures to identify molecules that protect hair cells from ototoxic damage. Of 51 compounds examined, only concanavalin A (Con A) significantly protected hair cells from gentamicin. A dose-dependent study of Con A showed that maximal protection occurred at 100 nM. The protective effects of Con A on hair cells were confirmed with confocal microscopy and paraffin sectioning of the cultures. Several experiments were performed to examine the mechanism of protection by Con A. Incubation of Con A with gentamicin did not form a complex and coaddition of Con A and gentamicin to Escherichia coli cultures did not interfere with the antibiotic activity of gentamicin. However, Lyso-Tracker staining and gentamicin immunocytochemistry provided evidence that preincubation with Con A blocked gentamicin uptake into hair cells. Considered together, these findings may help elucidate the ototoxic mechanism of aminoglycoside antibiotics, and suggest that Con A may be of therapeutic value in prevention of aminoglycoside-induced hearing loss.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10213451&dopt=Abstract








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